jsp链接Mysql数据库,代码问题、求指导

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

        <h2>用户登陆</h2>

        登陆 ID:<input type="text" name="userid"><br>
        登陆密码:<input type="password" name="password"><br>
        <input type="submit" value = "登陆">
        <input type="reset" value = "重置">

<%!
public static final String DBDRIVER = "com.mysql.jdbc.Driver" ;
public static final String userName = "root"; //登录的用户名
public static final String userPasswd = "root"; //登录mysql密码
public static final String dbName = "test"; //数据库名
public static final String tableName="form1"; //表名
public static final String DBURL = "jdbc:mysql://localhost:3306/"+dbName+"?user="+userName+"&password="+userPasswd;
%>

<%
Connection conn = null ;
PreparedStatement pstmt = null ;
ResultSet rs = null ;
boolean flag = false ; // 表示登陆成功或失败的标记
%>

<%
String userid = request.getParameter("username") ; // 接收表单参数
String password = request.getParameter("password") ; // 接收表单参数
try{
Class.forName(DBDRIVER) ;
conn = DriverManager.getConnection(DBURL) ;
String sql = "SELECT userid,password FROM tuser WHERE userid=? AND password=?" ;
pstmt = conn.prepareStatement(sql) ;
pstmt.setString(1,userid) ;
pstmt.setString(2,password) ;
rs = pstmt.executeQuery() ;
while(rs.next()){
// 如果有内容，则此处执行，表示查询出来，合法用户
flag = true ;
}
}catch(Exception e){
}finally{
try{
conn.close() ; // 连接一关闭，所有的操作都将关闭
}catch(Exception e){}
}
%>
<%
if(flag){ // 登陆成功，应该跳转到success.jsp
%>

<%
}else{ // 登陆失败，跳转到failure.jsp
%>

<%
}
%>

参考一下：http://blog.csdn.net/chinacsharper/article/details/39777643

public static final String DBURL = "jdbc:mysql://localhost:3306/"+dbName+"?user="+userName+"&password="+userPasswd;
改成
public static final String DBURL = "jdbc:mysql://localhost:3306/"+dbName;

然后把
conn = DriverManager.getConnection(DBURL) ;
改成
conn = DriverManager.getConnection(DBURL, userName, userPasswd );

<%@page contentType="text/html" pageEncoding="UTF-8" %>

登陆操作!

        </tr>
        <tr>
            <td>登陆 ID:</td>
            <td><input type="text" name="id">
            </td>
        </tr>

        <tr>
            <td>登陆密码:</td>
            <td><input type="password" name="password">
            </td>
        </tr>

        </tr>

        <tr>
            <td colspan="2"><input type="submit" value = "登陆!">
            <td colspan="2"><input type="reset" value = "重置!">
            </td>
        </tr>
    </table>

</form>

用户登陆

<%@ page contentType="text/html" pageEncoding="GBK"%>

登陆失败!!!!!!

<h2><a href= "login.jsp">点击重新登陆!!!!!!!!</a></h2>

完整代码在这里：http://www.cnblogs.com/elleniou/archive/2012/09/11/2680418.html

JSP连接MySql数据库方法，可参考这个

http://jingyan.baidu.com/article/0aa2237599b89888cc0d64c0.html